[0] | 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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[2] | 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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[0] | 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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[2] | 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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[0] | 208 | //ll |
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