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 hostent * he; |
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68 | //unsigned int host_div = 0; |
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69 | int (*mode_func)(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen) = connect; // default is to connect |
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70 | |
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71 | if ( mode == MODE_LISTEN ) |
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72 | mode_func = bind; |
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73 | |
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74 | if ( type == ROAR_SOCKET_TYPE_UNKNOWN ) { |
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75 | type = ROAR_SOCKET_TYPE_INET; |
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76 | if ( *host == '/' ) |
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77 | type = ROAR_SOCKET_TYPE_UNIX; |
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78 | } |
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79 | |
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80 | |
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81 | ROAR_DBG("roar_socket_open(*): type=%s, host='%s', port=%i", |
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82 | type == ROAR_SOCKET_TYPE_UNIX ? "UNIX" : "INET", host, port); |
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83 | |
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84 | memset(&socket_addr, 0, sizeof(socket_addr)); |
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85 | memset(&he, 0, sizeof(he)); |
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86 | |
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87 | |
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88 | if ( type == ROAR_SOCKET_TYPE_INET ) { |
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89 | |
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90 | if ( (he = gethostbyname(host)) == NULL ) { |
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91 | ROAR_ERR("roar_socket_open(*): Can\'t resolve host name '%s'", |
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92 | host); |
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93 | return -1; |
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94 | } |
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95 | |
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96 | memcpy((struct in_addr *)&socket_addr.sin_addr, he->h_addr, sizeof(struct in_addr)); |
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97 | |
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98 | /* set the connect information */ |
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99 | socket_addr.sin_family = AF_INET; |
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100 | socket_addr.sin_port = htons( port ); |
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101 | |
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102 | fh = roar_socket_new_tcp(); |
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103 | |
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104 | if ( mode_func(fh, (struct sockaddr *)&socket_addr, sizeof(struct sockaddr_in)) == -1 ) { |
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105 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
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106 | close(fh); |
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107 | return -1; |
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108 | } |
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109 | // hey! we have a socket... |
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110 | } else { |
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111 | fh = roar_socket_new_unix(); |
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112 | close(fh); |
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113 | return -1; |
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114 | } |
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115 | |
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116 | if ( mode == MODE_LISTEN ) |
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117 | if ( listen(fh, ROAR_SOCKET_QUEUE_LEN) == -1 ) { |
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118 | close(fh); |
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119 | return -1; |
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120 | } |
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121 | |
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122 | return fh; |
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123 | } |
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124 | |
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125 | // --- [ PROXY CODE ] --- |
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126 | |
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127 | // generic proxy code: |
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128 | |
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129 | int roar_socket_open_proxy (int mode, int type, char * host, int port, char * proxy_type) { |
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130 | int proxy_port; |
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131 | char proxy_host[ROAR_SOCKET_MAX_HOSTNAMELEN]; |
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132 | char * proxy_addr; |
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133 | int i; |
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134 | int fh; |
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135 | |
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136 | // TODO: change this so we support listen() proxys (ssh -R) |
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137 | if ( mode != MODE_CONNECT ) |
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138 | return -1; |
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139 | |
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140 | if ( !strcmp(proxy_type, "socks4a") ) { // for TOR, the only supported type at the moment |
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141 | proxy_addr = getenv("socks_proxy"); |
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142 | |
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143 | proxy_port = 9050; // TOR's default port |
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144 | |
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145 | if ( proxy_addr == NULL ) |
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146 | return -1; |
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147 | |
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148 | for (i = 0; proxy_addr[i] != 0 && proxy_addr[i] != ':' && i < ROAR_SOCKET_MAX_HOSTNAMELEN; i++) |
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149 | proxy_host[i] = proxy_addr[i]; |
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150 | proxy_host[i] = 0; |
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151 | |
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152 | if ( i == 0 ) // no hostname found |
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153 | return -1; |
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154 | |
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155 | if ( proxy_addr[i] == ':' ) |
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156 | proxy_port = atoi(&proxy_addr[i+1]); |
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157 | |
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158 | if ( (fh = roar_socket_open(mode, type, proxy_host, proxy_port)) == -1) { |
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159 | return -1; |
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160 | } |
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161 | |
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162 | if ( roar_socket_open_socks4a(mode, fh, host, port) == -1 ) { |
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163 | close(fh); |
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164 | return -1; |
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165 | } |
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166 | |
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167 | return fh; |
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168 | } else { |
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169 | return -1; // unknown type |
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170 | } |
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171 | } |
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172 | |
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173 | // protocoll dependet proxy code: |
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174 | |
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175 | int roar_socket_open_socks4a(int mode, int fh, char * host, int port) { |
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176 | char buf[9]; |
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177 | int len; |
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178 | |
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179 | buf[0] = 0x04; |
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180 | buf[1] = mode == MODE_CONNECT ? 0x01 : 0x02; |
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181 | *((uint16_t*)&buf[2]) = htons(port); |
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182 | buf[4] = 0x00; |
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183 | buf[5] = 0x00; |
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184 | buf[6] = 0x00; |
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185 | buf[7] = 0x01; |
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186 | buf[8] = 0x00; |
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187 | |
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188 | if ( write(fh, buf, 9) != 9 ) |
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189 | return -1; |
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190 | |
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191 | len = strlen(host); |
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192 | |
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193 | if ( write(fh, host, len) != len ) |
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194 | return -1; |
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195 | |
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196 | if ( write(fh, "\0", 1) != 1 ) |
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197 | return -1; |
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198 | |
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199 | if ( read(fh, buf, 8) != 8 ) |
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200 | return -1; |
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201 | |
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202 | if ( buf[1] != 0x5a ) |
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203 | return -1; |
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204 | |
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205 | return 0; |
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206 | } |
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207 | |
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208 | //ll |
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